#include"Class.h"
int main()
{
	Date d1(1901, 1, 1);
	Date d2(2000, 12, 31);
	//d1+=-100;
	//Date d3 = d1 + 27;
	//d1.Print();
	//cout << endl;
	//d3.Print();
	//cout << endl;
	cout << (d2 - d1)/7 << endl;
}